User interface for a portion of a display screen



FIG. 1 is a front view of a user interface for a portion of a display screen showing our new design; and,

FIG. 2 is an enlarged front view thereof, the user interface is shown separately for clarity of illustration.

In both figure views, the broken line showing of various regions and the unshaded areas within the claimed design form no part of the claimed design. The broken line showing of a portion of a display screen in FIG. 1 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a user interface for a portion of a display screen, as shown and described. 